Low-E cooler baseline decisions:

1. Low-E cooler baseline decisions: • FNAL’s cooling section “as is” – with weak solenoids, correctors, etc. (to prevent over focusing from ion beam). 2.Cooling section beam pipe size – compatible with existing solenoids and RHIC aperture limitations: 3” OD (S. Tepikian showed that one can get acceptable RHIC optics). 3.BPM’s design for 3” OD pipe (2.87”ID) – to be done based, on FNAL’s design of 2” BPM’s 4.Electron beam transport in/from cooling section - under one ion beam line with an angle towards other ion beam line. 5.Blockhouse/Pelletron location @ IR4 - inside cryo-lines. For detailed presentations on these topics see: http://www.bnl.gov/cad/ecooling/LowEnergyEcooling.asp

2. Low-E cooler @IR4: Available from FNAL Q3 Electron beam is tilted at an angle – this removes two 90 deg. bends. Now, in addition to FNAL bends, we have: - four 90 degree bends – to be designed! - one 180 degree bend (of most importance!!!)

3. Aggressive schedule is required to meet final timeline Preliminary cost estimate of the project – November 2009 (done) Estimate of C-AD manpower November 2009 (done) Physics design complete December 2010 Architectural design & layout July2010?-June 2011 Electrical design & layout – November2010-November 2011 Mechanical design & layout – November2010-November 2011 Site preparation – February 2011- March 2012 (14 month) Recycler’s cooler disassembly and transport October 2011-February 2012 (5 month) Electron cooler installation March 2012 –January 2013 (10 month) Commissioning February 2013 -July 2013 (6 month)+ GOAL: Available for FY14 RHIC physics run (starts November 2013). -2014 run: should expect luminosity optimization (partial improvement) -starting 2015 – expect full luminosity improvement

5. Most C-AD manpower will be needed in FY12 & FY13

6. Near-term milestones June 2010: • Accurate hardware cost estimate and manpower from controls ! • Accurate hardware cost estimate and manpower from instrumentation ! • Results from first Low-E Physics run • Results from beam dynamics limits at Low-E RHIC June-July 2010: • Updated luminosity projection with cooling (better than estimated previously!) • Updated cost of the project • Review of the above and decisions • End of summer: definite plans from FNAL? • Start of Architectural, Mechanical, Electrical design can be probably delayed until about July 2010? without overall impact on project end date. Fall of 2010 – start of AIP project? • Delayof start of full scale AIP project beyond January 2011 will result in a delay of luminosity improvement with cooling beyond 2014-2015 which may be not consistent with timeline of Low-E RHIC program. NICA program (>2015, physics in 2016?), etc.

7. Some “near-term” tasks • Transport of electron beam at lower energies; design of bending magnets; evaluating needed control of field quality (X. Chang, J. Kewisch) • Design of turn around (U-turn) of electron beam between cooling sections. Checking preservation of electron beam quality with additional bends, lowest energy (X. Chang, D. Kayran, J. Brodowski) • Electron cooler optics. Electron beam (X. Chang, J. Kewisch) • Ion beam optics for cooling section (S. Tepikian) – done (preliminary) • Careful consideration of “angular budget” in the cooling section from various effects in full energy range of interest (A. Fedotov) – to be presented • Interaction of electron and ion beams. • Undulators “to be or not to be?” (A. Fedotov) - done, to be presented • Updated luminosity projections with cooling (A. Fedotov) – done, to be presented • Cooling section and diagnostics (D. Gassner)